A 1,1,2-trifluoro-2-(trans-4-substituted cyclohexyl)ethylene of the formula (1): R--(A).sub.m --Cy--CF=CF.sub.2 (1) wherein R is a C.sub.1-10 alkyl group, a halogen atom or a cyano group, provided that in the case of the alkyl group, an oxygen atom may be interposed in a carbon-carbon bond of the alkyl group or in a carbon-carbon bond between this alkyl group and A, some of carbon-carbon bonds in the alkyl group may be triple bonds or double bonds, one --CH.sub.2 -- group in the alkyl group may be substituted by a carbonyl group, and some or all of hydrogen atoms in the alkyl group may be substituted by fluorine atoms; Cy is an unsubstituted trans-1,4-cyclohexylene group; A is a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a 1,4-cyclohexenylene group, wherein each of such cyclic groups is unsubstituted or substituted by one or more halogen atoms or cyano groups, one or more =CH-- groups constituting rings of such cyclic groups may be substituted by nitrogen atoms, and one or more --CH.sub.2 -- groups constituting rings of such cyclic groups may be substituted by oxygen atoms or sulfur atoms; and m is 0 or 1.
该公式为:R--(A).sub.m --Cy--CF=CF.sub.2 (1),其中R是一个C.sub.1-10烷基基团、一个卤素原子或一个
氰基团,但是在烷基基团的情况下,
氧原子可以插入烷基基团的
碳-
碳键或者在该烷基基团和A之间的
碳-
碳键中,烷基基团中的一些
碳-
碳键可以是三键或双键,烷基基团中的一个--CH.sub.2--基团可以被羰基取代,烷基基团中的一些或全部
氢原子可以被
氟原子取代;Cy是一个未取代的反式1,4-
环己基基团;A是一个反式1,4-
环己基基团、一个1,4-
苯基基团或一个1,4-
环己烯基基团,其中这些环状基团中的每一个未取代或被一个或多个卤素原子或
氰基团取代,构成这些环状基团的一个或多个=CH--基团可以被
氮原子取代,构成这些环状基团的一个或多个--CH.sub.2--基团可以被
氧原子或
硫原子取代;m为0或1。